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Your installer just needs to spend a little more time confirming charge and air flow. TXV means he HAS to charge using super heat / sub cool methods. As far as sweating, only an indication that you are too hot.

The indoor split is contingent on the humidity level.
If the indoor humidity is high, a 16-F split would be okay.

The normal blower position blows air through the coil, & therefore the only increase in its percentage of normal air pass-through (by-pass) would be due to the increase in velocity & CFM through the indoor coil - with blower door-panel removed.

If the blower is drawing air through the coil, with blower door removed, it could be a near total by-pass of the indoor coil. The TXV would shut the liquid flow way down helping to protect the compressor; a fixed orifice metering device would in a short time, be a major liquid slugging threat to the compressor.